Furnace-bell hoist.



T. E. BROWN. FURNAOE BELL HOIST.

APPLIouIon rum) uno. 4. 1912.

Patented Feb.2,1915.

nr Non/Hs Mrrlms CO nlmmLlrND WASHINM'ON, o c.

T. E. BROWN. runnen BELL nom. APPLICATION FILED DBO. 4. 1912. 1,127,351, Patented Feb. 2, 1915.

2 SHEETS-SHEET 2.

w/msssfs.- s l .L J /m/f/vron UNITED STATES PATENT @FFF/SEE.

THOMAS E. BROWN, OF NEW YORK, N. Y., ASSIGNOR TO OTIS ELEVATOR COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

FURNACE-BELL HOIST.

Specification of Letters Patent.

Patented Feb. 2, 1915.

To all Iwhom it may concern.'

Be it known that I, THOMAS E. BnowN, a citizen of the United States, residing in New York, in the county of New York and State of New York, have invented a new and useful Im rovement in Furnace-Bell Hoists, of whic the following is a specication.

My invention relates to bell hoisting mechanism for use in connection with blast furnaces.

An ob'ect of the invention is to provide improve means for operating the bells which seal the furnace.

Other objects of the invention and the exact nature thereof will appear hereinafter.

Referring to the accom anying drawings which illustrate an embo iment of my invention, Figure 1 is a part sectional elevation view of a furnace with the invention ap lied thereto; Fig. 2 is a detail view on a arger scale of my improved means for multiplying power which is transmitted to hold the bells in sealed or closed position; Fig. B is a detail sectional view showing a sto device.

s shown in Fig. 1 a blast furnace A comprises a compartment 1 to receive a charge of coke, limestone, or ore, etc. The bottom of this compartment is closed by a large hell 2. At the upper end of the compartment 1 is a receptacle or hopper 4 which xtends into said compartment and has its lower end closed by a small bell 8. The bell 2 is connected through a rod 5 to a walking beam or lever 6', connected, bv a pivot 7, to the overhead frame work. The small bell 3 is connected to a hollow rod or tube 8 pivoted at its upper end to a walking beam The rod 5 extends through the tube 8. The charge for the furnace is hoisted from the pit 9 in skips 10 which travel along the inclined tracks 11. Hoisting ro es or cables 12 are connected to the skips an extend over a direction sheave 13 and from thence to the hoisting mechanism H. The parts thus far described may be of usual or well known construction.

The hoisting mechanism for operating the bell 8 comprises a small electric motor 14, connected through worm gearing or other speed reduction mechanism to a shaft 15 (Fig. 2) to which is secured a pinion 16. An annular gear 17 in mesh with the .inion 16 is secured to a crank shaft 18, to w ich is also fixed a crank 10. A connecting rod 20 extends from the crank to a lever 2l having a pivot 22 which connects the lever with the outer end of the walking beam 6. A counter-weight 232 which, as shown in Fig. l, is made 1n sections for the purpose of adjustment, is connected through the chain 24 to the outer. end of the lever 2l. Said chain runs on a guide sheave 25. An adjustable stop device is located directly over the connecting rod 20, and comprises a U-shaped piece 26 secured between the parallel mem- )ers of the lever 6. The head oi a bolt 27, which extends through the piece 2G, is located directly over the upper end of the connecting rod 20, in position to be engaged thereby, as will presently be described. Vashers 28 form a convenient means of adjusting the position of the stop 27.

In o eration, when a skip 10 has discharge its load of coke, or ore, or other material, into the hopper 1, the bell hoisting motor 14 is started and operates to impart one complete rotation to the annular gear 17. The current is then automatically' cut oil' and an electric brake 29 is applied to bring the mechanism to rest with the parts in the position shown in the drawings. When the crank 19 commences its rotation the rod 20 is carried up into engagement with the stop 27. The levers 21 and 6 then maintain a fixed relative position and operate as a unit until the crank 19 has nearly completed its rotation. As the outer end of the lever 6 moves upward, the hell 3 is lowered and permits the material in the hopper to fall into the compartment 1. As the rod 2O is carried downward the bell 3 is again lifted to its closing position, which is reached shortly before the crank 19 has completed its rotation. The lever 21 is then rotated about its pivot through a small angle, thereby separating the connectin rod from the stop 27. If the lever 21 is pivoted at its center the downward pull on the rod 2O will be equal t0 the weight 2B, but the downward pressure at the pivot 22 will be double this amount. In other words, by the use of the lever 2l and weight 23, the downward pull at the outer end of the lever 6 is double that of the usual arrangement in which the connecting rod is pivoted directly to the walking beam. The upward pressure ap )lied through the walking beam to the bell 8 is correspond ingly increased. This is an important feature of the invention, as the power applied' through the walking beam must be sullicient not only to hold the combined weight of the bell and the charge supported thereby, but the bell must be sealed gas tight against the top rim of the furnace. It will be seen that with the svstem of leverage employed the tor ne of the motor need not be more than half that required to o erate the usual mechanism. lt will also e observed that the weight 23 acts as a partial.- coimterbalance weight for the charging material, so that the duty required of the motor is materially lessened during. the intermediate portion of its operation. The lever 21 of course need not be pivoted at the center, as the pivot point may be shifted in eitherdirection, resulting in a corresponding variation in the leverage obtained. Another advanta Te of the present arrangement is that the. be is always heldclosed with full` power while the motor is at rest and does not require the accuracy of adjustment that is' required when the connecting rod 2O is pivoted` directly to the walking beam. In the latter case anyI wear of the parts, looseness in the bearings, etc.,

will tend to relievethe pressure on the bell. This is not true, however, of the present in. vention, where the power is transmitted through thelever 21, as any variation in the adjustment or wear of parts, etc., will operate merely toI slightly vary. the angleof the lever '21, without in an. Way affecting the pressure applied to the ell.

I wish not to be limited to the precise construction herein shown, as various modifications mi ht be made by those skilled in the, art, witiout departing from the spirit and scope of the invention,

WhatI claim as new and desire to secure by Letters Patent of the United States is z- 1. Tn a furnace, the combination of a bell. a walking-beam, a connecting rod between the bell ,and one end of the walking beam, a lever pivoted to the other end ofthe beam, hoisting mechanism, aconnectingI rodi between said mechanism and one end of. thel said lever, a weight supported from the. other end of said ever, and a stop to limit, the movement of the said lever about its fulcrum.

E2. In a furnace, the combination of a bell, a. walking beam, means to connect said parts, a lever pivoted to the Walking beam, an adjustable stop in position'to limit the relative movement of the lever and walking-4 beam, and ahoisting device and counterweight connected to the lever.

3. In a. furnace, the combination of al closure, a walking-beam connectedthereto and operable to move the said closure intoy and outpf closedposition, nalever pivoted to the walking beam, an adius'table stop, car med` bv the beam, operating yrnechtmi'sin ,cenneetedg to 4the lever, and t means to' hold .the

lever against said stop during the movemeiif` of the closure and permitting independent4"* movement of the lever when the closure is in closed position.

l. In a furnace, the combination of a bell forming a closure for the furnace, a walking-beam, a rod connecting one end of the walking-beam to the bell, a lever pivot/:d to the. opppsite end of the walking-imam, a stop carried b v the walking beam, a crank shaft, a crank, a connecting rod connected tothe crank and one end of the lever, a weight connected to the opposite end of; the lever suflicient-to hold, the lever against the stop. during, the movement of the bell, the parts being so adjusted that the. bell will be, brought to. closedposition and the lever moved out of contact with the stop as the crank ncursaa dead center position, and means to rotate the crank shaft.

5. A blast furnace hoist comprising a charging bucket, moans for hoisting said bucket, a-bell, a closure for said bell, means to lift and lower said closure into and out of closed position, and means independent of said hoisting. means for multiplying the pressure with'which said closure. is held in closed position..

6. A. blast4 furnace hoist, comprising` a charginglbucket, means for hoisting said bucket, a belli, a closure for said bell, means to liftand lower said closure into and out of closed position, and means independent of said hoisting means for automatically applying a holding pressure. to the closure after it reaches a closed position.

7. A, blast furnace hoist comprising a chargingl bucket, means for hoisting said bucket, a furnace4 bell, motor mechanism associatedV withsaid bell for operating it to and froma closed position, and means independent of the said hoistingr means and associated with said motor mechanism for permitting! av continued operation of the motor mechanism after the bell has reached a closed position.

8. A blast furnace hoist comprising a chargingl bucket, means for hoisting the bucket, a closure for the furnace, means for operating saidclosure independent of said hoist means, anda compound leverage. systern forming an operating connection be` tween said mechanism and the closure.

9. A blast furnace hoist comprising a chargingbucket, hoisting rmechanism therefor, a furnace bell, a walking beam connected thereto, a counter-weight pivoted to said walking benin and adapted to maintain the bcllin close-d position with a predetermined pressure, and means independent of said oisting mechanism for varying said pressure.

10. .A blastA furnace hoist comprising a chargingbucket, hoisting mechanism therefor, a furnacebell, a walking. beam connectlief f to said bell, a lever pivoted to said beam, name to this specification in the presence of ii weightdon om1 end gf the lvelf, anddmleans two subscribing witnesses. connecte to t e ot er en o sai eveil v i I 1 n .I adapted to effect the operation of said bell THOMAS L' BRO 'JL' independently of the said bucket hoisting Witnesses:

mechanism. GUe'rAv linkami, In testimony whereof, I have signed my (ifUeTAv Wne'rnm.

@epics of this patent muy be obtained tot five eenta nach, by addressing the Commiaeionesr o Entente, Wnahlng'on, D. 0." 

